parkinson



UNITED STATES PATENT OFFICE.

JOSEPH PARKINSON, OF BRADFORD, COUNTY OF YORK, ENGLAND.

VISE.

SPECIFICATION forming part of Letters Patent No. 394,292, dated December11, 1888.

Application filed May 1, 1888. Serial No. 272,423. (No model.)

To a/ZZ 107mm it may concern.-

.Be it known that I, JOSEPH PARKINSON, a subject of the Queen of GreatBritain and Ireland, residing at lrh-adt'ord, in the county of York,England, have invented certain Improvements in Vises, of which thefollowing is a SpGClfiCittlOT].

This invention relates to certain improvements in parallel vises, andhas for its object the provision of means whereby the nut and vise-screwmay be moved out of mesh for allowing the sliding vise-jaw to be movedback and forth without turning the vise-screw; and it consists inraising the said screw by levers arranged in a novel manner andcombining with the screw mechanism for automatically operating thevise-nut in an opposite direction to that in which the screw is moved.

In the accompanying drmvings, Figure 1 represents a side elevation of aparallel vise having some of the parts cut away; Fig. 2, an end view.Figs. 3, 4c, and 5 are views of a modification; and Figs. (3 and 7 areviews, drawn to an enlarged scale, of the devices for raising the frontend of the vise-screw.

The fast jaw of the vise is denoted by the letter A and the loose orsliding jaw by 13, the latter having an oblong hole at C, through whichthe vise-screw passes, and is carried at the opposite end in the usualmanner. The vise-screw collar I) works against the end face of thesliding jaw, and is inclosed by a cap, E, which also acts as acarrying-plate for supporting-levers arranged in the following manner: Ajournal is formed in the lower portion of the said plate E, in which ismounted a short shaft having a lever, F, secured thereto on one side ofthe said cap-plate, and a lever, G, secured at an angle to the lever Fon the other side, and to the lever G is attached a yoke, H, partlyQIIllJlfl-Clll g the screw-collar D, inclosed within the space coveredby capplate E.

I11 the recess within theloose or sliding jaw B, I place on the screw asleeve, J, connecting thereto by link J a lever, K, fulerumed at L, andextending through a slot-hole cut in the shank of half-nut N, a spiralspring, S, being 011 the said shank compressed between the under side ofthe half-nut and vise-plate base, the half-nut being kept in positionfor receiving the strain by the lugs M M.

On pressing the lever F in the direction of the arrow toward thevise-screw the short lever G raises the yoke H and thereby thevisescrew, the latter causing thelever K to be operat-ed on its fulcrumand the half-nut N be moved toward the base-plate, thus furthercompressing the spiral spring b, thereby moving the vise-screw andhalf-nut in opposite directions to such an extent that the threads areclear or unmeshed, enabling the operator to move the loose or slidingjaw as required without turning the screw.

The connection between the sleeve .I and half-nut N may be accomplished,as shown by details 3, 4, and 5, representing a side view, end view, andplan of an arrangement in which a lever, P, is mounted on each side ofthe sleeve .I, the fulcrum pins or screws being supported by a lug, M,and the opposite ends of each leverP, instead of one passing through aslot-hole in the shank, as before described, are made with a projection,I, extendin g some distance over the side of the half-nut N, so that onraising the vise-screw, as described, the half-nut N is depressed,thereby unmeshing the threads and liberating the sliding jaw 13, to bemoved as desired.

\Vhat I claim is 1. The combination of the fixed and movable jaws of avise and operating screw with a sleexe on the front end of the latter, ahalfnut engaging with the threaded portion of the screw, and aconnecting-lever bet-ween the nut and sleeve, whereby on the raising ofthe front end of the screw the nut will be disengaged, all substantiallyas set forth.

2. The con'ibination of the fixed and movable jaws of a vise andoperating screw with a yoke and levers to raise the front end of thescrew, a sleeve on the latter, a half-nut to engage with the threadedport-ion of the screw, and a lever connecting the sleeve and halfnut, asand for the purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOSEPH PARKINSON.

Vitnesses: I

WILLIAM PREST, ISAAC OAUTHERY.

